[Bug 209612] games/trackballs: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209612

            Bug ID: 209612
           Summary: games/trackballs: Fix build with libc++ 3.8.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: martymac at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(martymac at FreeBSD.org)
          Assignee: martymac at FreeBSD.org

Created attachment 170451
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170451&action=edit
Remove hand-rolled abs functions from games/trackballs

During the exp-run in bug 208158, it was found that games/trackballs gives
errors with libc++ 3.8.0 [1]:

glHelp.cc:132:13: error: 'abs' is missing exception specification 'throw()'
inline Real abs(Real v) {return v>0.0?v:-v;}
            ^

This is because the program is attempting to define its own version of abs(),
which conflicts with the one from <cmath>.  Fix it by removing the custom
versions of abs().

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-05-01_10h29m48s/logs/errors/trackballs-1.1.4_21.log

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